33 6 



ZONES AND REGIONS 



[Pt. Ill, Sect. I 



vi. CAULIFLORY IN THE RAIN-FOREST. 



In temperate zones flowers appear mostly on the current year's twigs, 

 more rarely on those of the preceding year, but only in a few species, such 

 as Cercis siliquastrum, on older branches or stems ; whereas in constantly 

 humid tropical forests canliflory, that is to say the formation of flowers 



Fig. 179. Mendozia Vel- 

 loziana. Flower-buds surround- 

 ed by a pair of adherent bracts 

 filled with mucilaginous liquid. 

 Blumenau, South Brazil. 



Fig. 1 78. Ffeliconia Bihai. Boat-like bracts containing water. 

 Half the natural size. From Flora Brasiliensis. 



> 



Fig. 180. Clerodendron Mina- 

 hassae. Water-holding calyx 

 of a fruit. Natural size. After 

 Koorders. 



on old wood, is not rare. It is occasioned by the fact that dormant 

 axillary buds become further developed after several or many years, and, 

 breaking through the cortex, freely expand their flowers (Figs. 181 

 and 182). 



In cauliflory the flowers appear sometimes only on main stems, some- 

 times only on branches, sometimes, and this is most usual, on both main 



